101 lines
1.5 KiB
C
101 lines
1.5 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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char *argv0;
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static void
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verr(const char *fmt, va_list ap)
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{
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if (argv0 && strncmp(fmt, "usage", sizeof("usage") - 1)) {
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fprintf(stderr, "%s: ", argv0);
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}
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vfprintf(stderr, fmt, ap);
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if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
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fputc(' ', stderr);
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perror(NULL);
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} else {
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fputc('\n', stderr);
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}
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}
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void
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warn(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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verr(fmt, ap);
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va_end(ap);
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}
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void
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die(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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verr(fmt, ap);
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va_end(ap);
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exit(1);
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}
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const char *
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bprintf(const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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if ((ret = vsnprintf(buf, sizeof(buf), fmt, ap)) < 0) {
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warn("vsnprintf:");
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} else if ((size_t)ret >= sizeof(buf)) {
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warn("vsnprintf: Output truncated");
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}
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va_end(ap);
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return buf;
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}
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const char *
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fmt_scaled(size_t bytes)
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{
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unsigned int i;
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float scaled;
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const char *units[] = { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
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"ZiB", "YiB" };
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scaled = bytes;
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for (i = 0; i < LEN(units) && scaled >= 1024; i++) {
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scaled /= 1024.0;
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}
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return bprintf("%.1f%s", scaled, units[i]);
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}
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int
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pscanf(const char *path, const char *fmt, ...)
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{
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FILE *fp;
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va_list ap;
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int n;
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if (!(fp = fopen(path, "r"))) {
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warn("fopen '%s':", path);
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return -1;
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}
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va_start(ap, fmt);
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n = vfscanf(fp, fmt, ap);
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va_end(ap);
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fclose(fp);
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return (n == EOF) ? -1 : n;
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}
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